For example, the number of managers required to screw in a light bulb is a discrete quantity. The number may be 6 or the number may be 7. It cannot be any number between these two.
Whereas, the weight of an object is a continuous quantity. For example, if an object weighs 10 kg and another object weighs 11 kg, if you remove some material from the second object, you can get any value between 10 kg and 11 kg